Those of you who have the INRAD Roofing Filter Kit in your 1000MP's might be
interested in the following modification to improve the IMD numbers reported by
The mod was developed by Mike, W2AJI. It apparently reduces the gain a little
in the roofing filter 2 stage amplifier.
I have not yet tried the modification but it looks simple, involving the
change of only two resistors.
I also believe, as does Mike, that the filter is actually a little wider than
the specifications state. I have no trouble copying AM stations on my main rx.
The filter kit I have is my second one due to a failure of the filter in my
first kit purchased two years ago. The bandwidth of the first kit seemed a bit
tighter than the one I presently have but it is still an
improvement over the stock radio.
73, Dennis W0JX/8
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